How to Say "to brew" in Spanish
The Spanish word for “to brew” is “cocer” — C1 level.
English → SpanishC1
verbC1informal
something happening or being planned in secret

Examples
Algo se está cociendo en esa oficina.
Something is brewing in that office.
Using 'Se'
When things are 'brewing' or 'happening,' we almost always use the reflexive form 'se cuece' to show the action is unfolding on its own.
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